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# File actionpack/lib/action_view/template/resolver.rb, line 83def templates_have_changed?(cached_templates,fresh_templates)# if either the old or new template list is empty, we don't need to (and can't)# compare modification times, and instead just check whether the lists are differentifcached_templates.blank?||fresh_templates.blank?returnfresh_templates.blank?!=cached_templates.blank?endcached_templates_max_updated_at=cached_templates.map(&:updated_at).max# if a template has changed, it will be now be newer than all the cached templatesfresh_templates.any?{|t|t.updated_at>cached_templates_max_updated_at}end